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Inconsistent Aperture

Discussion in 'Fuji X100 Forum' started by kevenv, Oct 20, 2011.

  1. kevenv

    kevenv SC Regular

    96
    Apr 28, 2011
    Seem that the dreaded sticky blades is starting to affect me. I only noticed this yesterday and it is happening maybe once in every 8-10 shots. I emailed Fuji Canada, awaiting a reply.

    These are both supposed to be f/16


    These are both f/11


    Finally both of these are f/8
     
  2. BBW

    BBW Administrator Emeritus

    Jul 7, 2010
    betwixt and between
    BB
    keven, what exactly happened that alerted you to this - was it what you saw when you looked at your files in Lightroom or whatever software you use?
     
  3. kevenv

    kevenv SC Regular

    96
    Apr 28, 2011
    Actually BB it was a thread on another forum called "Is this f/16?". The OP had a pic of what his X100 was closing down to at f/16 and didn't think it looked small enough. That prompted me to again check mine out. In the past I had checked that the aperture was stopping down at each position, just to keep an eye out for sticky blades but honestly I never considered how big the opening should be. The first half press at f/16 looked fine but I did a few more and lo and behold there was the bigger opening. I tried it a bunch more just to be sure, going to f/11 and f/8 as well. At each stop the same thing happened as shown in the pics. Maybe 1 in 8 or 10 tries. Awaiting a reply from Fuji Canada.
     
  4. BBW

    BBW Administrator Emeritus

    Jul 7, 2010
    betwixt and between
    BB
    Hang on...I believe Don has an explanation that may help explain what you're seeing.
     
  5. Streetshooter

    Streetshooter Administrator Emeritus

    Jul 12, 2010
    Philly, Pa
    Kevin,
    First off.... Test the camera with a very consistent scene. The exposure must be the same for all images in the sequence...so,
    Shoot the scene at every fstop. Do not look at the aperture.
    Then do random fstops skipping one or two like...
    F4....f11....f5.6...f2.8...f8 etc.
    Then look at the files in LR and they should all be properly exposed.
    That's the first step.... Post your findings...
    I'll be around...don
     
  6. kevenv

    kevenv SC Regular

    96
    Apr 28, 2011
    Thanks for your help Don. I did as you outlined. If I use the first pic as a baseline (f16) the next three stops down were consistently 2+ stops over exposed. F/4 was same as f/16. F2.8 and 2 were 1+ stops underexposed when compared to the original f/16. When I jumped around in aperture, the results were similar, with two notable exceptions. F/16 was about 2 stops over exposed compared to the original and f/11 was about a stop underexposed when compared to the original f/11. EXIF data was identical for each set of apertures.
     
  7. Streetshooter

    Streetshooter Administrator Emeritus

    Jul 12, 2010
    Philly, Pa
    Contact Fuji, the camera is faulty.
    Sorry, but this way you know and you now have data to send them.
    Don
     
  8. kevenv

    kevenv SC Regular

    96
    Apr 28, 2011
    Thanks Don. Now that we have established my camera is faulty, could you explain what would have been happening if the exposures were the same? Both for my own interest and perhaps to others reading this? Thanks again for your time.

    Regards
    Keven
     
    • Like Like x 1
  9. Streetshooter

    Streetshooter Administrator Emeritus

    Jul 12, 2010
    Philly, Pa
    Kevin, the camera may have said f11 but really was at f11.3 for example. This would allow correct exposure but not the correct f number. So the aperture could in face be correct the the software didn't change the number.

    What I suggested to you for testing was actually a process of elimination.
     
    • Like Like x 2
  10. BBW

    BBW Administrator Emeritus

    Jul 7, 2010
    betwixt and between
    BB
    Keep us posted, Keven. And thanks to you and Don for discussing this here for all of us.
     
  11. kevenv

    kevenv SC Regular

    96
    Apr 28, 2011
    What I just noticed is in Preview (Mac Program) when I check EXIF data there are two entries pertaining to aperture/F stop. The first entry is "aperture value" the second (last in my list) is Fnumber

    The first is from the F/2 picture:

    Aperture Value: 2
    Brightness Value: 3.8
    Custom Rendered: Normal process
    Date Time Digitized: 2011:10:20 11:13:46
    Date Time Original: 2011:10:20 11:13:46
    Exif Version: 2.3
    Exposure Bias Value: 0
    Exposure Mode: Auto exposure
    Exposure Program: Aperture priority
    Exposure Time: 1 / 200
    File Source:
    Flash: Flash did not fire, compulsory flash mode
    FNumber: 2
    -both values are the same

    Next a pic for F/11

    Aperture Value: 6.919
    Brightness Value: 3.72
    Custom Rendered: Normal process
    Date Time Digitized: 2011:10:20 11:12:40
    Date Time Original: 2011:10:20 11:12:40
    Exif Version: 2.3
    Exposure Bias Value: 0
    Exposure Mode: Auto exposure
    Exposure Program: Aperture priority
    Exposure Time: 1 / 50
    File Source:
    Flash: Flash did not fire, compulsory flash mode
    FNumber: 11
    -values different

    picture for f/8

    Aperture Value: 6
    Brightness Value: 3.92
    Custom Rendered: Normal process
    Date Time Digitized: 2011:10:20 11:13:12
    Date Time Original: 2011:10:20 11:13:12
    Exif Version: 2.3
    Exposure Bias Value: 0
    Exposure Mode: Auto exposure
    Exposure Program: Aperture priority
    Exposure Time: 5 / 294
    File Source:
    Flash: Flash did not fire, compulsory flash mode
    FNumber: 8
    -values different

    Finally F/4

    Aperture Value: 4
    Brightness Value: 3.72
    Custom Rendered: Normal process
    Date Time Digitized: 2011:10:20 11:14:00
    Date Time Original: 2011:10:20 11:14:00
    Exif Version: 2.3
    Exposure Bias Value: 0
    Exposure Mode: Auto exposure
    Exposure Program: Aperture priority
    Exposure Time: 5 / 294
    File Source:
    Flash: Flash did not fire, compulsory flash mode
    FNumber: 4
    -same numbers

    The pics with matching values are exposed much better than the mismatched values. Knowing nothing about the "aperture value" I am assuming that this is the number that it actually stopped down to. Maybe Don has a better idea of what I am looking at.
     
  12. kevenv

    kevenv SC Regular

    96
    Apr 28, 2011
    Just received my camera back from Fuji Canada. Sent it to them on Monday. Pretty quick service. They replaced the lens and everything is now working perfectly. It's like a new camera! I think the aperture issue crept up on me without me noticing until it was flagrant. Alls well that ends well.
     
    • Like Like x 1
  13. Streetshooter

    Streetshooter Administrator Emeritus

    Jul 12, 2010
    Philly, Pa
    Keven, thanks for updating the thread.
    I'm glad it worked out and so quickly at that.
    Don
     
    • Like Like x 1
  14. BBW

    BBW Administrator Emeritus

    Jul 7, 2010
    betwixt and between
    BB
    Excellent news, Keven. I'm very glad to read this.:2thumbs:
     
  15. greyelm

    greyelm SC Top Veteran

    844
    Oct 1, 2011
    London, England
    Having had my X100 recently repaired for the sticky aperture problem I can confirm that it can creep up on you. I finally realised when I tried some F16 shots on a sunny day and got gross over exposure and when I tested each aperture the exposure improved as I got closer to f2. As I mostly use auto the camera wasn't selecting the higher f numbers often and I didn't always get overexposure. So I would suggest that everyone runs the tests periodically. I found Fuji UK very efficient and it was easy to arrange the repair on line.
     
    • Like Like x 1
  16. BBW

    BBW Administrator Emeritus

    Jul 7, 2010
    betwixt and between
    BB
    I haven't noticed anything amiss but will follow Don's advice as outlined above.

    Just wondering when you two received your cameras initially?
     
  17. kevenv

    kevenv SC Regular

    96
    Apr 28, 2011
    I bought my camera in July, serial number starts with 12A.
     
  18. stillshunter

    stillshunter Super Moderator Emeritus

    Nov 5, 2010
    Down Under
    Mark
    ...and how many shutters do you think you did Kev before she started to slow down?

    I admit I'm looking at my lil' Fuji a bit differently since hearing about this inherent affliction...like she has a latent disease that I'm just waiting to surface. I want us to be back to how we were in the beginning...:frown:
     
  19. kevenv

    kevenv SC Regular

    96
    Apr 28, 2011
    I finally noticed the problem a week and a half ago (after about 1850 pics). Like greyelm, I often just leave the cam in P mode and so never really noticed it creeping up. The occasional blown exposure I blamed on me. What really tipped me off was an afternoon walk in the sun, when I was in A mode and zone focused with f/16 (my samoyed wouldn't stay still lol). I don't review every pic, only checking the first one or two to make sure I am on. Of course the walk ended and I loaded the pics into LR and there it was a bunch of over exposed pics mixed in with the good ones. I then started looking at the openings as I half pressed the shutter, noticing from time to time a noticeable difference in sizes at the same aperture.

    Many thanks to Don for his help in diagnosing this. His method enabled me to determine for sure that I had a problem.I think everyone should do the same from time to time, I know I will!
     
    • Like Like x 2
  20. stillshunter

    stillshunter Super Moderator Emeritus

    Nov 5, 2010
    Down Under
    Mark
    Thanks Kev. I suspected it might just creep up on you. I experimented a little on my morning stroll yesterday, changing apertures and spying the blade openings as I half-pressed the shutter. There seemed to be some subtle differences but nothing dire...yet. Scarily though when I got back to LR it was horrific. Not so much any exposure issues but the barrage of awful photos trained up my nose.....at least the X100 nailed the focus. Unfortunately! But damn that near silent shutter! Suffice it to say that I'll be out buying a better set of clippers at lunch break today :blush:

    Back to the blades. It's reassuring to hear that Fuji are honouring the repairs of these units. I only hope that, much like the Digilux 2 sensor issue that Leica still warrants to this day, that Fuji will get all the X100s out there mended. However, has Fuji determined the root of the problem and isolated it to batches or addressed the design fault with the reissued lenses? I just fear Fuji installing new units that simply give the X100 another few months/1000 shutters and then we're back in the shop again. Hmmm....